Adding a button with an external link to a product description

Can anyone help? I have directory of businesses listed on my site and for the purposes of my website design they are uploaded as products (service products). I use the Clay template. I have disabled the add to cart button as obviously I am not selling a product, but I still need a button under my product description to direct people to those individual websites.

Is there a way to do it? I have attempted to add the button in the ADDITIONAL INFORMATION section but that takes the button right down to the bottom of the page nit underneath the description. Can anyone help? Is there some code I can use? I need it to state VISIT WEBSITE.